SimpleRenderer着色法渲染地图

代码：

 private void button2_Click(object sender, EventArgs e)
        {
            IActiveView pActiveView;
            IGeoFeatureLayer pGeoFeatureL;
            pActiveView = this.axMapControl1.ActiveView;
            IMap pMap = this.axMapControl1.Map;
            pMap.ReferenceScale = 0;//设定label是否随地图缩放而变化
            pGeoFeatureL = pMap.get_Layer(4) as IGeoFeatureLayer;
            IFillSymbol pSimpleFillS;
            ILineSymbol pLineSymbol;
            pSimpleFillS = new SimpleFillSymbolClass();
            pSimpleFillS.Color = getRGB(120, 110, 200);
            pLineSymbol = new SimpleLineSymbolClass();
            pLineSymbol.Color = getRGB(255, 0, 0);
            pLineSymbol.Width = 1;
            pSimpleFillS.Outline = pLineSymbol;
            ISimpleRenderer pSimpleRenderer;
            pSimpleRenderer = new SimpleRendererClass();
            pSimpleRenderer.Symbol = (ISymbol)pSimpleFillS;
            pSimpleRenderer.Description = "USA";
            pSimpleRenderer.Label = "简单渲染";
            ITransparencyRenderer pTransRenderer;
            pTransRenderer = pSimpleRenderer as ITransparencyRenderer;
            pTransRenderer.TransparencyField = "地区";
            pGeoFeatureL.Renderer = pTransRenderer as IFeatureRenderer;
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
        }